The **3SB 15-R** refers to a specific type of electronic indicator lamp/pilot light, most commonly associated with industrial control panel components (similar to the Siemens SIRIUS 3SB series). These are essential interface devices that provide visual feedback on the status of a circuit or machine. --- ## 1. Technical Specifications The "15-R" variant typically denotes a **Red** indicator light. Below are the standard technical characteristics: | Feature | Specification | | :--- | :--- | | **Component Type** | Indicator Light / Pilot Light | | **Diameter** | 22mm (Standard mounting hole) | | **Color** | Red (R) | | **Illumination Source** | Integrated LED or BA9s Bulb (Model dependent) | | **Operating Voltage** | Typically 24V AC/DC, 110V AC, or 230V AC | | **Protection Class** | IP65 / IP67 (Dust and water resistant) | | **Connection Type** | Screw terminals or Spring-loaded terminals | --- ## 2. Key Electronic Components A 3SB indicator is comprised of several distinct parts designed for industrial durability: ### A. The Actuator (Lens) The visible red plastic part. It is designed to diffuse light evenly. In the "R" series, this lens is made of high-grade polycarbonate to resist chemical exposure and heat. ### B. The Holder (Support) The structural frame that secures the light to the control panel. It ensures a tight seal to maintain the IP rating. ### C. The Lamp Block (The Electronic Core) This is the functional electronic element. Modern units use **LED blocks** which offer: * **Low Power Consumption:** Usually <20mA. * **Longevity:** Rated for up to 100,000 service hours. * **Vibration Resistance:** Solid-state components prevent failure in heavy machinery environments. ### D. Terminal Connections The rear of the unit features input terminals marked **X1 (+)** and **X2 (-)** for electrical wiring. --- ## 3. Circuit Application In an industrial control circuit, the 3SB 15-R is usually wired in parallel with a load or connected to a PLC (Programmable Logic Controller) output. ```mermaid graph LR A[Power Supply] --> B[Emergency Stop/Sensor] B --> C[PLC Output] C --> D[3SB 15-R Red Light] D --> E[Ground/Neutral] ``` --- ## 4. Maintenance and Installation * **Mounting:** Uses a "twist and snap" mechanism into a 22.5mm cutout. * **Replacement:** The light blocks are often modular, meaning you can replace the electronic LED element without removing the red lens from the front of the panel.